Brake shoe construction



Sept. 12, 1950 P. R. MGEACHRAN 2,521,988

BRAKE SHOE CONSTRUCTION Filed Feb. 21, 1945 3 Sheets-Sheet 1 EACt-IDAN.

INVENTOR.

ATTORNEY.

I DAULIQ. MC

P 1950 P. R. MGEACHRAN 2,521,988

BRAKE SHOE CONSTRUCTION Filed Feb. 21, 1945 [s Sheets-Sheet 2 DAUI. D.McEAcHQAN,

INVENTOR.

BY W

ATTORNEY.

Sept. 12, 1950 P. R. M EACHRAN 2,521,988

BRAKE SHOE CONSTRUCTION Filed Feb. 21, 1945 3 Sheets-Sheet 3 L.'II/IIIIIIIII DAUL D. MCEACHDAN,

INVENTOR.

BY WWI/7W ATTORNEY.

sponding to Fig. 1 showing a further modification of the invention;

Fig. 11 is a sectional view as taken along line ll--ll in Fig. 10;

Fig. 12 is a broken away plan view as taken on line l2-l2 in Fig.

Fig. 13 is a sectional view as taken on. Iii-I3 in Fig. 10;

Fig. 14 is a partly broken away perspective view of a slipper type brakeshoe construction in.. which the features of this invention have beenincorporated; a

Fig. 15 is a sectional detail thereoi as taken on line I5----l5inFig.l4;9 V

Fig. 16 is a side elevation or face view of the 15 supporting portion ofthe slipper construction with the friction elements removed, as taken online I6--l6 of Fig. 15;

Fig. 17 is a view corresponding to Fig. 16, showing the supportingportion with the friction el ements and their 's'upportin'g'basesremoved; as

line

taken on line [1-41 inFig 15; and] N Fig. 18 is a sectional detail astaken'on line l8- -l8 in Fig. 14. V w b In the form of the inventionillustrated in'Figs. 1 through 6, the'brake shoe assembly is'shown ascomprising a bracket I, ada'pted'to be mounted" within a housing or thelike provided'for'anexpending type of brake. The bracket "I carriestwopivotally disposed "base-members 2' and 3 adapted to be disposed-in alongitudinally alined operative relation as shown in Fig.1 or .to bepiv- 1 otally moved into'an opened (inoperative) posi---: tion such asshownvin Fig. 2 to facilitate-the re moval or insertion of frictionalelements herein-. 5 after more particularly described. In this form ofthe device-each of the-base members 2 and he provided with a frictionalelement, as shown at I and 5, which is slidably-mountedonthe respectivebase member. The slidingattachment of. the friction elements 4 and 5tothe base members 2 and 3may be accomplished in anyone of a, 'plu- Trality of .ways, asthrongh the agency oi female k dovetail 6 providedinthejbasernember and'jcor. acting l ve a l] P ov des .ini e; i t onelement, the dovetails extending longitudinally pr 4 th'e' base membersi. e; in the direction oirelative movement between the brake snoefanqtnerelatively movable element against Whichth de'-" sired frictionengagement is to be efie'ctd in use? The female dovetails s extend fromthe in'- 5 nr end of the basem'embersi and 3 toward's th'e outer end and'are terniinated' in abutments oishoulders 8 closely adjacent thepivotal mounting 9 of. the base members z-upon' the bracketl Thefriction elements *4 and "5 arerem'oved from or inserted upon thecorrespondingxba'se:membersi' 2 and 3 when the base membersarein-theopened (inoperative) position indicated in Fig; 2', and are pushedtoward the shoulder meansB andin engagement therewith.- When'thebasemembers 2 and 3 are pivotally moved into thepperative position ofFig. 1, the respectivelyinwardly. di- 1 rected ends 4a andSwoftheirictionelements-4 and 5 are brought into abutment as shown inFig.

1, and the basemembers 2 and; may be retained in this folded conditionthrough the agency of; a. pin or bolt H v.wl ich extendsthroughopenings. at the inner ends of the-base members 2 and-3, the openings l2being conveniently iormed in lugs or projections 13 formed as part, of.thefbase. members 2 and 3. A coacting opening maybe provided on thebracket through whichthe pin or bolt l I may be extendedjin thelocking'ope'rm tion. The bracket l is preterably jprovided with abacking plate Ia adaptedto'underlie and sup we Fi i port the members 2and 3, and the pivotal mountingof the base members at 9 may be formedafter the manner of a hinge, the respective hinge portions beingprovided through the agency of ears 15 on the base members 2 and 3 and alug It on the bracket I. The backing plate la may be cut away asindicated at I'i, for reception of the lugs 13 which are provided'on'the base members 2 and 3.

:1 The shoulder means 8 constitute means for retaining the frictionelements 4 and 5 against movement to the right and left, respectively,

while the inner enddaof the element 4 restrains theelementliagainstmovement to the right and the inner end 5a; of the element 5'restrains the element 4 against movement toward the left.

' The inner ends' la and 5a of the elements 4 and 5 thus constituteabutment or shoulder means in dependent of the base members 2 and 3 andopii icti n elements in the and entirely separable base member 21 at oneend,

mi i h a fixed n sefilemb' r it ims ah' re a... formed integrally nger?xedlyf attach he, br ck i 5-; .Thenbteie me b 2' a ticarrylongitudinallyinterlocked 'sjlidable'l 'frict'i 4 elements 4' and 5'.Shoulder means!!! arepr Fl a ficla ffl pie id. ndl'o h men hersljiaildi' gai st" w ch thespacedn s o e Elem ts! f and. fjmeyi1t jlratives s -i I. .sb 'sememberi is ivota y m n d nonfit ,...hii. k fi PMtS' te sl dsasji rqueb't e. en y mhye s lysps d 7. l5' -o'n the baseinernber 2 adapted. engaeell ste preferably ronr ded oiffa I,olwer;surface.to j f permit a freefswinging o ement,' -pi?0t -.wise,' fthe base member alw'afir rprnlthejbracket, lifti tneg'cenira rimmer?) i.1 toafiosition such that he base rnembermay be. removed bodil y from'thle bra'cket" The inner j f' he s member. 3'..-.mar.. e attach d. t fthe bracket I "1 in operative'positionjthrough,the}; agency, of'a pinor. bolt 11f enter dingthrough; penin s ;whi i onve e t be. med llilimitation .13 rinedi a the base, member-l i Accesses. et in m be. rm awe b ack tx ihreui h h c the... n P 1 1 m xt d n iz fi l is p ration 1,,ii In order tc replace a orn pair, of .friction .ele ments in' the'structure, assuming the parts to, be in the foperatiyef positionofFigafl, the pin.or,., bolt, ll may begreniove d; the base memberj'.swung away, from .thebracketlithus' separating nabn t n innercn sgofih;,l .ction elements-i sl d, 91.1%. altos iqn suchgasshown t-the p ernortionj flis'i In emen may- '71 the arrow; appear ng i thereon in. thendrawing The'element 5' maybe withdrawn from the base I member 3' .whenthe basemember .3. isremoved; by movement in the. s recaqnpr. thearijow. .ap pearingon said.elementnfllhelbase' .rneinben. i will bemadejof such circumferential length-that. P n-i 'e e ga et a ke -J .i rs-: be ample room between the inner end of the basexmfimberrda'eaindrthe (lug: l5. etoncompletelyiwithiimiwthevfrictioncelementiefromthe interlocking imfiansion thebase"member.vv Imthe'form ofainventionwshown in Eigtl-sthe "base-'!nember: 1 2 tom-responding to ithe; base member?! in =Fi'gsl);ismadeof a fsomewh'atfgreateemrlengthc than is required (according- 51:0*Bmth-at'the ibasamember'may be sm-mg"apivotaliy about athe pivot: i9 '7to clift th'e innerendraway iimmethe bracket: 1- 'sandthe 2other= base"ember fi tandrpermitremoval ofatheaelement l' by slid ingi putof thebase member "2' 'raftr f t-he lmaii' nea er ;thatveriiployed in the formshown I in liigs'. kande; without disturbingthe base"member B' Thezihasefimemberis" Anay 'be bolteduponfthe bracket 'ras'indicated atam;if desired, rpivotally mounted as in Tithe ."case :of the dorm shcwninfilig; :1, and :the inne'r' end of the base member 21,=;r.emovabl-yattached ad the "bracketas at $9 *"llhe positionorthe'swung-outbase me ber 2 mpermitthe sliding removal of elem'isgindicated'in dot dash linesin Fig. '9';

Sine-alternative construction shown "in li'i'gs; iflxthrough 1331sentirely comparable {to the for s shown in- =1- through16;b1'1tdifferih'g in" li'at the base members corresponding to parts land' il of ithe=iirst-describedforih of the invention are formed assheet metal parts 22 and 23 which are pivotally mounted upon the bracket24 at as 25 ,(oorl'esponding .to the pivot -9-t5--lt-of the first'formof the invention), andv the inner ends of the base members 22 andtsmareinterlocked with the bracket 24 through the agency ofdependingears 26 provided with opening 2'Ialined. I

with coasting openings in arlug zt providedon the bracket 24,,and heldin position acrea e the agencywf bolts or the like zfl. Thefoi'med sheetmetal base members 22 and23 are so shaped as to provide an attachmentmeans such as of the dovetail type to form a longitudinally extend mgcooperation with the mating l portiohs df the friction members which areindicated at 3|. The hinge mounting 25 may be relied upon to provide anabutment shoulder 32 at the respective outer ends of the base members 22and 23, corresponding to the abutment or shoulder 8 shown in the firstform of the invention, and the friction members 3! may be attached tothe base members in the same manner as that described above, i, e., byremoving the bolt 29, opening the base members 22 and 23 to the openedposition of Fig. 2, sliding the friction element into the cooperatingenga ing means provided by the dovetail slide portion into abutment withthe shoulder 32, after which the base members may be folded downwardlyinto their longitudinally alined posi tion indicated in Fig. 10 and thebolt 29 re- In this condition, the adjacent inner- I the abutment at theshoulders am, as will be,

- apparent.

Figs. 14 through l8'illustrate the application of my invention to a disctype of brake shoe, and referring thereto, a disc member against whichthe frictional effort is to be applied is shown at 50, upon which a pairof arcuate friction elements 5| are adapted to bear. The elements 5| arecarried by a pair of base members 52 which arearcuenacted?thrtughthe-agency: of anoperating bar Y (not show'n)sextending through a 1ug 5'9formedimithe support; The'frictionareleinents :5 l rnay persecuted to the respective basemember'sut'z by means foratongue and groove or dovetail struc f turezsdchxas shownatfifi'andqfin Fig'spl d-"and indicated at-" m' suchdcveta11 'str ur'es being arranged concentricany'about the-aids c otthedlsc 5:), whereby the "imposed ri'ctional' effort-er the elements'rtil dbh" the disc 50 willebe directed along the" length ors u'ch dovetailstriic tux-es: Shoulder means are providedat tn'e nin g'e endscf thebasemmbersfias-att 'and the 'inner ends- 510 tr theiel'rnentsfil areadapted to abut as in the prioi' described forinsof'tl'ieihvehtioh;whereby the frictional irort of the elemehtsds transmitted tofthesupporter;

- Tau crane ram the invention 'the' 'fric tion elements' are arrangedinecactin "s, d irie ts fto' ppdrtin strdct v yb'f an iritrcbnno ti'ohwhi'ch'is 'e'ely siidable in "the dire tied-15f application-"offrictionaleifor ante-to movementbei-figs 'rd'by ck cg he? respectiveelements of each'pair ag movement' 'bnposite irections by against on mayracing shoulder fne and causihg tne eiments t6 abutagainsttfie andtnerto provide resistance to movement in the direction opposite to thatresisted by said shoulder means.

The described forms of the invention are to be taken as illustrativeonly; other forms of the invention will occur to those skilled'in theart and I choose rather to be limited to the scope of the subjoineclclaims.

I claim: I

1. A brake shoe construction adapted to cooperate with a relativelymovable member to establish a frictional load, which comprises: a

pair of elongated base members longitudinally,

alined in end-tc-end relation in the direction of relative movement ofsaid construction and said movable member: support means for said basemembers; cooperating attachment means on said support means and saidbase members including pivot means at the respective spaced ends of saidbase members establishing said base members for pivotal movementrelative to each other and to said support means; an elongated frictionmember slidably disposed upon each of said base members through theagency of longitudinally extending cooperating attachment means on saidbase members and saidiribtion members; shoulder means on each of saidbase members at the respective spaced ends thereof, said frictionmembers being adapted to engage the respective shoulder means at theirspacedends and being adapted to compressively engage each other at theiradjacent ends in an end-to-end abutting relation.

2. A brake shoe construction adapted to cooperate with a relativelymovable member to" nation oneness establishba frictional load;- whichcomprises: a pairof: elongated base, members longitudinally alined inend-.to-end relation inithe direction of relative movementysupport meansfor said base members; cooperating attachment means on said supportmeans andsaid base members'including pivot-means atthe respectivespaced'ends of each of'said base members establishing said-basemembers'for pivotalmovement relative to each'other out: of saidend-to-end relation into 'an' assembly position and for movement ofoneof said base membersswith respect to said support means; an elongatedfriction memberslidably disposedzupon' each oii'ssaid base membersthrough the agency of longitudinally extending cooperating attachmentmeans'on said base members and on said friction members; shoulder meanson each of said base members-at :the respective opposite spaced endsthereof,' said base members being adapted to receivesaid frictionmembers when disposed in said assembly position and said frictionmembers being adapted to slide upon said base members'into engagementwith the respectiveyshoulder means attheir; spaced ends, and beingadapted to compressively engage-Leach otheratwtheir adjacent ends ini anend-to-end abutting relation'when said basemembers aremoved from saidassembly positioninto said end-to-end relation. 1

.3. A brake shoe construction as set forthin claim 1, and comprising inaddition: locking means adapted to engage the otherends-of said basemembers to retain said base members in said end-toe ndtrelation. v r

Hi. -.In .a brake shoe construction adapted to co'- operate with-arelatively movable member to establisha frictionalload, the-combinationwhich comprises: two elongated base-members longitudinallyralined inend-to-end relation in the direction 1 of relative movement of saidmovable member-;.,separate elongated friction means slidably attached toeach of said base members-through the agency of longitudinally extendinginterlocking' attaching means on each basemember'andon the respectivefriction means; and support means for said base membersto establish'said friction means in an operative: position with relation to saidrelatively movable member and with the adjacent ends'of the respectivefriction'means in an end-to-end abutting relation with eachother;each-base member being provided with shoulder means engaging theopposite ends of the respective friction means; pivot means on one ofsaid base members and-.on'said support m'eans to estab lish pivotalinterconnection of said one base member to said'support meanslat aposition longitudinally removed from the position of said adjacentabutting 'endsof said friction means, whereby said one base member ismounted for movement with respect to'said support means about an axisdefined by said pivot means to an assembly position such as to separatethe abutting end of the friction means. carried by said one base memberfrom the adjacent'end of the friction means carried by the other of saidbase members and thereby freely expose both ofsaid friction means forremoval from the respective base members by longitudinal slidingmovement thereof away from the respective shoulder meansl:

Y Y PAUL- R. MCEACHRAN.

= REFERENCES CITED The following references are of record in the file ofthis patent? v v c. UNITED STATES PATENTS 32,672 Australia .....s Apr.25, 1903

